I would gladly donate if only I had the money and the only thing I expect out of my money with the quality of the anime itself. Looking at it realistically all donors can't expect to get their names in the credits or merchandise or stuff like that so...
I think it doesn't matter if it's sharp since you need to be running fast to impale someone in the first place. At those speeds, the unfortunate dude would be dead regardless how sharp this bit is.
